package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //通过切入点指定我们需要拦截哪些类或者哪些方法
    @Pointcut("execution(* com.sky.mapper.*.*(..))&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFilePointCut(){}
    //前置通知，在通知中进行公共字段的赋值
    @Before("autoFilePointCut()")
    public void autoFilePointCut(JoinPoint joinPoint){
        log.info("开始进行字段自动填充...");
        MethodSignature signature=(MethodSignature) joinPoint.getSignature();//方法前面
        AutoFill autoFill=signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.type();//获得数据库操作类型
        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length==0) {
            return;
        }
        Object entity = args[0];
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        if (operationType == OperationType.INSERT) { //根据当前不同的操作类型，为对应的属性通过反射来赋值
            try { //为4个公共字段赋值
                Method setCreateTimeMethod=entity.getClass().getDeclaredMethod("setUpdateTime",LocalDateTime.class);
                setCreateTimeMethod.invoke(entity,now);//相当于 category.setCreateTime(now);
                Method setUpdateTimeMethod = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                setUpdateTimeMethod.invoke(entity,now);
                Method setCreateUserMethod = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
                setCreateUserMethod.invoke(entity,currentId);
                Method setUpdateUserMethod = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                setUpdateUserMethod.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }else {
            try {//为2个公共字段赋值
                Method setUpdateTimeMethod = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                setUpdateTimeMethod.invoke(entity,now);
                Method setUpdateUserMethod = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                setUpdateUserMethod.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }



}
